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Watanabe, Akira and Sarno, - and Lumbanraja, Jamalam and Tsutsuki, Kiyoshi and Kimura, Makoto (2001) Humus composition of soils under forest, coffee and arable cultivation in hilly areas of south Sumatra, Indonesia. European Journal of Soil Science, 52. pp. 599-606. ISSN 1365-2389